Abstract

Electrochemicalimpedance spectroscopy (EIS) has been used to study the soluteuptake for epoxy/phenolic (E/p) and epoxy/amine (E/a) thick-coated mild steel samplesimmersed for 160 days in 3.5 weight percent NaCl solutionexposed to air. Samples with thicknesses of approximately 200 µm withan exposed surface area of 22.6 cm2 were used tofollow solute saturation of the organic coating. Good agreement was obtainedbetween the calculated and measured coating capacitance when, according to thediffusion equation, the coating capacitance was plotted against exposure time.